Operation Principle And Hardware Description; Contents Of This Chapter; Operation Principle - ABB ACS880-207LC Hardware Manual

Operation principle and hardware description 15

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Operation principle and hardware
description

Contents of this chapter

This chapter describes the operation basics and the hardware of the IGBT supply unit
(ACS880-207LC).

Operation principle

IGBT supply unit rectifies three-phase AC current to direct current for the intermediate DC
link of the drive. The intermediate DC link supplies the inverters that run the motors. There
can be one inverter unit only (single drives) or several inverter units (multidrives) connected
to the intermediate circuit.
The LCL filter is an essential part of the IGBT supply unit. The supply module does not work
without the filter. It suppresses the AC voltage distortion and current harmonics. The high
AC inductance smooths the line voltage waveform distorted by the high-frequency switching
of the converter. Capacitive component of the filter effectively filters the high-frequency (over
1 kHz) harmonics.